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Residential Loans - Additional Information (Detail)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
loan
Contract
Mar. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
loan
Contract
Mortgage Loans on Real Estate [Line Items]      
Transfers from loans held-for-sale to loans held-for-investment $ 660,818 $ 447,840  
Transfers from loans held-for-investment to loans held-for-sale 54,747 0  
Principal balance of loans sold during period 1,240,000 2,200,000  
Carrying value of loans 3,715,056   $ 3,928,803
Redwood      
Mortgage Loans on Real Estate [Line Items]      
Carrying value of loans 2,785,029   2,906,933
Sequoia      
Mortgage Loans on Real Estate [Line Items]      
Carrying value of loans $ 930,027   $ 1,021,870
Fixed-rate loans      
Mortgage Loans on Real Estate [Line Items]      
Weighted average coupon rate 4.16%    
Residential Loans      
Mortgage Loans on Real Estate [Line Items]      
Principal value of loans purchased $ 1,190,000 2,400,000  
Residential Loans at Fair Value      
Mortgage Loans on Real Estate [Line Items]      
Number of loans | loan 588   1,763
Loan Principal $ 429,000   $ 1,090,000
Valuation adjustments 5,000 2,000  
Loan pledged as collateral 414,000    
Carrying value of loans 440,000   $ 1,110,000
Loans held-for-investment, in foreclosure $ 1,000    
Residential Loans at Lower of Cost or Fair Value      
Mortgage Loans on Real Estate [Line Items]      
Number of loans 9   9
Loan Principal $ 2,000   $ 2,000
Financing Receivable, Number Of Loans In Foreclosure | loan 1    
Carrying value of loans $ 1,402   1,433
Residential Loans at Lower of Cost or Fair Value | Redwood      
Mortgage Loans on Real Estate [Line Items]      
Carrying value of loans 1,402   1,433
Residential Loans at Lower of Cost or Fair Value | Sequoia      
Mortgage Loans on Real Estate [Line Items]      
Carrying value of loans $ 0   $ 0
Residential Loans Held For Investment at Fair Value      
Mortgage Loans on Real Estate [Line Items]      
Number of loans | loan 3,096   2,398
Loan Principal $ 2,280,000   $ 1,760,000
Valuation adjustments 23,000 2,000  
Transfers from loans held-for-sale to loans held-for-investment 660,000 448,000  
Transfers from loans held-for-investment to loans held-for-sale $ 54,000 0  
Carrying value of loans     $ 1,790,000
Weighted average original Fair Isaac Corporation (FICO) score 772    
Weighted average original loan-to-value (LTV) 66.00%    
Percentage of fixed-rate loans 99.00%    
Residential Loans Held For Investment at Fair Value | Sequoia      
Mortgage Loans on Real Estate [Line Items]      
Number of loans 4,221   4,545
Weighted average original Fair Isaac Corporation (FICO) score 729    
Weighted average original loan-to-value (LTV) 66.00%    
Loans held-for-investment, delinquent greater than 90 days $ 51,000   $ 59,000
Loans held-for-investment, in foreclosure 26,000   32,000
Valuation adjustments $ (36,000) $ 3,000  
Residential Loans Held For Investment at Fair Value | Hybrid loans      
Mortgage Loans on Real Estate [Line Items]      
Weighted average coupon rate 4.00%    
Residential Loans Held for Investment | Sequoia      
Mortgage Loans on Real Estate [Line Items]      
Loan Principal $ 1,060,000   1,120,000
Carrying value of loans 930,000   $ 1,020,000
Mortgage servicing rights      
Mortgage Loans on Real Estate [Line Items]      
Servicing Asset at Amortized Cost $ 1,880,000    
Financing Receivables, Equal to Greater than 90 Days Past Due | Residential Loans at Fair Value      
Mortgage Loans on Real Estate [Line Items]      
Financing Receivable, Number Of Loans Past Due 90 Days Or More | loan 0   2
Financing Receivable, Number Of Loans In Foreclosure | loan 1    
Financing Receivables, Equal to Greater than 90 Days Past Due | Residential Loans at Lower of Cost or Fair Value      
Mortgage Loans on Real Estate [Line Items]      
Financing Receivable, Number Of Loans Past Due 90 Days Or More | loan 2   2,000
Jumbo Loan | Residential Loans at Fair Value      
Mortgage Loans on Real Estate [Line Items]      
Carrying value of loans $ 438,287   $ 984,486
Jumbo Loan | Residential Loans at Fair Value | Redwood      
Mortgage Loans on Real Estate [Line Items]      
Carrying value of loans 438,287   984,486
Jumbo Loan | Residential Loans at Fair Value | Sequoia      
Mortgage Loans on Real Estate [Line Items]      
Carrying value of loans 0   0
Jumbo Loan | Residential Loans Held For Investment at Fair Value      
Mortgage Loans on Real Estate [Line Items]      
Carrying value of loans 3,273,980   2,813,065
Jumbo Loan | Residential Loans Held For Investment at Fair Value | Redwood      
Mortgage Loans on Real Estate [Line Items]      
Carrying value of loans 2,343,953   1,791,195
Jumbo Loan | Residential Loans Held For Investment at Fair Value | Sequoia      
Mortgage Loans on Real Estate [Line Items]      
Carrying value of loans 930,027   $ 1,021,870
Residential Loans | FHLB Chicago      
Mortgage Loans on Real Estate [Line Items]      
Loans pledged as collateral under borrowing agreement with FHLBC $ 2,340,000    
Originated Between 2013 and 2016 | Residential Loans Held For Investment at Fair Value      
Mortgage Loans on Real Estate [Line Items]      
Percentage of loan portfolio originated in year 93.00%    
Originated 2012 and prior years | Residential Loans Held For Investment at Fair Value      
Mortgage Loans on Real Estate [Line Items]      
Percentage of loan portfolio originated in year 7.00%